20011982 has 8 divisors (see below), whose sum is σ = 30044952. Its totient is φ = 9997000.

The previous prime is 20011967. The next prime is 20011987. The reversal of 20011982 is 28911002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1244 + ... + 6447.

It is an arithmetic number, because the mean of its divisors is an integer number (3755619).

Almost surely, 2^20011982 is an apocalyptic number.

20011982 is a deficient number, since it is larger than the sum of its proper divisors (10032970).

20011982 is a wasteful number, since it uses less digits than its factorization.

20011982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8994.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 20011982 is about 4473.4753827421. The cubic root of 20011982 is about 271.4959577578.

Adding to 20011982 its reverse (28911002), we get a palindrome (48922984).

The spelling of 20011982 in words is "twenty million, eleven thousand, nine hundred eighty-two".